Tool for setting bushings or inserts



March 30, 1948. M. J. FLYNN TOOL FOR SETTING BUSHINGS OR INSERTS FiledFeb. 12, 1944 1 IX a gwua/rvbo' v flazaz'ced." @2279,

Patented Mar. 30, 1948 Maurice J. Flynn,

Crompton &

Mass a corporation at Massachusetts Knowles Loorn' Worcester, Mass,assignor to Works; Worcester,

Arm a w errets?! 12, iesgeni l i t tf fil (Cl: M -10) 7 Claims. 1

This invention relates to improvements in tools for setting bushings andit is the general object of the invention to provide a tool by which thebushing can be placed correctly for setting and then punched to hold itin the part into which it has been inserted.

It has been found difiicult to secure attachments to aluminum ormagnesium by screws] directly engaging the latter due to the fact thatscrew threads in such metals are easily mutilated. It is found that if ascrew is threaded into and then unscrewed from a tapped hole in suchSoft metals the threads suffer rapid deterioration such as prevents afit of requisite tightness. "It has been the practice heretofore toovercome this difiiculty by inserting hard metal bushin s into the softmetal, base and then secure the attachments to the bushings. Asheretofore practiced, however, this operation has been tedious and timeconsuming owing to the difficulty oi maintaining the top surface of thebushing flush with the adjacent surface of the base while the bush.- ingis being fastened to the base.

It is an important object of my present invention to provide a toolhaving a threadedstem projecting from a shoulder so arranged that thebushing can be threaded on the stem up to the shoulder. The tool is thenrotated to thread the bushing into the tapped hole of the soft basemetal. When the shoulder of the tool engages the surface of the basemetal the top of the bushing will be flush with the surface of thebase.A set of punches are then depressed toupset adjacent parts of the basemetal and bushing to hold the latter in place. tion is performed whilethe bushing is held in correct position with respect to the base metal.

It is another object of the invention to provide means by which thepunches will'normallybe in inoperative position where they will notinter-.

fere with threading the bushing into thebase metal. This feature of myinvention may-include a spring actuated cap which yields. under a hammerblow to cause all of the punches to have the upsetting operation at thesame time."

After the bushing has thus been secured to the base metal the punchesare raised by the spring to permit turning the tool in a reversedirection without scratching the base metal.

When the upset metal left by the punching" operation projectsappreciably above the surface of the base or bushing it may interferewith turning of the tool. It is another object of my invention toprovide means which prevent-,the ifi The punching oper 3 new n y 2 upsetmetal" from interfering with the itooh it ,rnedreyer ey e o W th he Ifand' other ob 'cts' in "view will appear the-description proceeds, -:my:ms

ventio residesin tne combinatienend arranges pentot" arts" hereinafterdeseribed and' -"set in "the" accompanying-- drawings;- wherein fourmeinvnuenareshown s-a ver't al sec-ten through a tobhmade I A to thereferred; term: or my: present inventic showing the" bushing and a (he.adjacentfmetal into which the bushing zl's thread; 1

Fig fifisra bottom-plan view 0! steamer-Hand bushing'looliing-in thedirection-or arrhwt; Eig 3shows a base of Seaman: a-iifittmg orattachment held thereto 'by means are screw threaded a' pusnmg wmen has--been'bsetzrih 0 v the use "of' my improvedotoolp Fig 4 i'sfavertical-section tlirough the hushing, rig; v 551s; a view simmerm Fig.2 bht wifihithe i o d and:showing?thefirstlmbdtvention,

float n of H ofiaontalseetionien line sea-s nger,

Fig: 9" is a view similar to '1 but showing --v"' in.

' ichjthe attaehm ntis to-besecures.

have Shawn; anattacnof any desired formand of the base.

to hold the bushing securely in the base.

points I4 of the punches. form at point 22, see Fig. 6, 'as a result ofthe setting the bushing with respect to the base 2, and permits thebushing first tobe threaded into the base metal and then secured to thebase by a punching operation. In carrying the preferred form of myinvention into effect I provide a tool body I having an outer knurledsurface 8. "Extending downwardly from the body! is a shank 9 the'diameter of which will, always be larger than the diameter of the hole 5in the base 2. The bottom of the shank 3 hasa surface or shoulder III toengage surface S of base 2 and surface I is perpendicular to the axis ofthe tool. r

Extending downwardly from the shank 9 is a reduced stem H havingexternal threads to fit the internal threads 6 of the bushing. The stemI I is concentric with the axis of the tool and may be of any lengthsufiicient to hold the bushing. Passing vertically through the body Iare bores l2, four being shown in the present instance. These bores arelocated at equal distances from the axis of the tool and extend upwardlyfrom the surface I0 through the top of body 1. Located within each boreis a punch [3 having a sharpened lower end It for a purpose to bedescribed. A cap I is fitted over and secured to the upper ends iii ofthe punches l3 and is recessed to receive the upper end of a lightcompression spring I! the lower end of which is located in a depressionof body I. The spring tends normally to raise the cap so that thesharpened points I of the punches do not extend below the surface III.The pointed ends I4 of the punches lie on a circle of substantially thesame radius as that of the tapped :hole in the base 2.

'In the use of the tool the bushing is first threaded on to the stem l luntil the upper end thereof engages the surface I6, after which the toolis turned to thread the bushing into the tapped hole 5 on the base 2.The tool is turned until the shoulder l0 engages the topsurface S of thebase, thus insuring alignment of the top surface of the bushing with theadjacent surface By a light hammer blow on the cap I5 the punches arethen depressed, thereby upsetting adjacent parts of the bushing and baseThe tool is then turned in the reverse direction and the stem Hunthreaded from the bushing, the latter remaining in the base 2. I, V vv In the use of the tool as already set forth small burrs are likely tobe upset in both the base 2 ,;and the bushing 4 which might interferewith unthreading of the stem II from the bushing. When these burrs aresmall little or no diificulty is experienced in removing the tool, butwhen they are large enough to project above the level of V surface I0 anappreciable amount they may interfere withthe reverse turning of thetool necessary to remove it from the bushing. I have set'forth hereinthree modifications of the general arrangement shown in Fig. 1 to adaptthe tool for use when the burrs are of considerable size.

7 The first modification is shown in Figs. 5 and'fi wherein'all theparts of. the tool-are as already described, but I add a smallconcentric groove 2| which is cut in upwardly in body 20 from surfaceIt]. The center of the groove is located at the samedistance from theaxis of the tool as the Any burr which may punching operation willthereforebe in the groove and will not interfere with the turning of thetool 29 when it is removed from the bushing,

In the second modification, shown in Figs. 7 and 8, the tool remains thesame as shown in Fig. l, but a flexible washer is used to space surface10 above the top surface of the base '2. In this sec ond modification Isurround the upper part of the stem H with a small washer 25 of lessdiameter than the bore 5 so that it will not interfere with the plungersl3, and below Washer 25 I place a second washer 26 of a flexiblematerial such as cork of a diameter preferably larger than that of bore5. When this second form of the invention is used the bushing isthreaded on the stem ll until it establishes a snug fit with the washer26,

Y after which the tool is turned to insert the bushing into the bore 5until the bottom of washer 26 engages the top surface S of the base 2.The plungers l3 are then depressed and pass through the soft cork washer26 to provide the usual upset deformations in the base and bushing.Since the washers space surface In above the base and bushing, the toolcan be turned in a reverse direction and be unthreaded from the bushingwithout interferenceon the part of the upset areas raised by thepunches. In Fig. 8 onesuch upset area, similar to 22 in Fig. 6, isindicated at A.

In the third modification, shown in Fig. 9, the :body of the tool 36 isaltered to provide a shoulder 3| which extends downwardly a slightdistance below surface Hi. In Fig. 9 this distance is somewhatexaggerated for clarity. In the use of this third form of the inventionthe bushing is threaded on to the stem 35 until it engages the shoulder3|. The bushing is then threaded into the bore 5 until surface If!strikes the top of the base '2, thereby locating the top surface of thethis space an insufficient amount to reach the surface ID. The tool may.therefore be turned in a reverse direction after the punching operationwithout danger of intereference on the part of the upset areas. V

In Fig. 9 I show a feature of the tool which can utilized in the otherforms if desired. Thestem 35 is made as a separate part and has a-shank36 driven upwardly into a bore 31 opening downwardly from the bottom ofthe tool through'the shoulder 3|. The shank 36 is smaller than thethreaded part of the stem 35 in order to limit upward movement of thelatter with respect to the tool. A vent hole 38 may be provided for theescape of air when the shank is driven into the bore 31. The shank 36 islocated centrally of the tool with respect to the plungers I 3, hencethe lower threaded end of the stem 35 serves to' locate the plungers inthe same position relatively. to the bore 5 as already described.

From the foregoing it will be seen that I have provided a simple tool bywhich a threaded bushing may be set into a base of soft metal. The toolhas a threaded stem to receive the bushing and also has a shoulder whichengages not only the bushing but also the adjacent surface of the base 2so that the top Surfacesof the base and bushing will both lie in the.same plane. It will also be seen that I have provided a simple means bywhich adjacent parts of the bushing and the next. It facilitates theoperation, however, to have all of the punches depressed at the sametime and it is for this reason that I have shown them attached to thecap Hi. In the drawings I have shown four punches, but with smallbushings three punches will sufilce, whereas with larger bushings it maybe necessary to increase the number of the punches. The points M of thepunches all lie on a circle which is concentric with the stem l l and itis for this reason that the upsetting referred to occurs at the correctpoints to secure the bushing to the base 2. It will further be seen thatthe modifications permit turning of the tool in the reverse directioneven though the burrs raised by the punches should extend upwardly abovethe surface Hi. This last result can either be accomplished by a groovein the bottom of shank 9, a flexible washer, or an extension on theshank which provides a space below the surface S for the formation ofthe burrs.

Having thus described my invention it will be seen that changes andmodifications may be made therein by those skilled in the art withoutdeparting from the spirit and scope of the invention and I do not Wishto be limited to the details herein disclosed, but what I claim is:

1. In a bushing setting tool having a body, a stem on the body rigidwith respect thereto to position the bushing with respect to the bodyand prevent relative lateral displacement between the bushing and body,a shoulder on the body transverse of the stem to engage the bushing andlimit movement thereof on the stem toward the body, the body having aseries of bores therethrough terminating in the shoulder, the axes ofthe bores at the shoulder being spaced from the stem by a distance equalsubstantially to the radius of the bushing, and punch means guided insaid bores for movement toward the bushing.

2. In a tool to set an externally and internally threaded bushing in abase having a screw threaded hole therein to receive the externalthreads of the bushing, said tool having a body, an externally threadedstem rapidly mounted on the body to fit the internal threads of thebushing and prevent relative lateral displacement of the body andbushing, a shoulder on the body transverse of the stem for engagementwith both the bushing and base, and punch means guided by the body in adirection to upset adjacent parts of the bushing and base to secure themtogether.

3. In a tool to set an externally and internally threaded bushing in abase having a screw threaded hole therein to receive the externalthreads of the bushing, said tool having a body, a threaded stem rigidwith the body to fit the internal threads of the bushing and preventrelative lateral displacement of the body and bushing, a bore in thebody parallel to the stern and having its axis spaced from the axis ofthe stem by a distance equal substantially to the radius of the externalthreads of the bushing, a shoulder on the body to engage both the baseand bushing, and punch means guided in said bore to upset adjacent partsof the bushing and base.

4. In a, tool to set an externally and internally threaded bushing in abase having a tapped hole to receive the external threads of thebushing, said tool having a body, an externally threaded stem rigid withthe body to enter the internal threads of the bushing and preventrelative lateral displacement of the body and bushing, a shoulder on thebody substantially perpendicular to the axis of. the stem to engage boththe bushing and the base, said body having a series of bores therein theaxes of which are spaced from the axis of the stem by a distance equalsubstantially to the radius of the external threads of the bushing, andpunch means guided by said bores for movement toward the bushing toupset adjacent parts of the bushing and base to secure them together.

5. In a tool to set an externally and internally threaded bushing in abase having a threaded hole to receive the external threads of thebushing, said tool having a body, an externally threaded stem on thebody to enter the internal threads of the bushing, a shoulder on thetool having a surface transverse of the stem for engagement with boththe bushing and the base, and means guided in the body to upset adjacentparts of the base and bushing to hold them together, said body having arecess extending thereinto from said surface to receive the portions ofthe base and bushing which are upset in the punching operation.

6. In a tool to set an externally and internally threaded bushing in abase having a threaded hole to receive the external threads of thebushing, said tool having a body, a stem on the body to enter theinternal threads of the bushing, the body having a series of holestherein the axes of which are parallel to the axis of the stem andspaced therefrom by a distance equal substantially to the radius of theexternal threads of the bushing, and a soft washer on the stem engagingthat end of the bushing adjacent to said body and engaging portions ofthe base adjacent to said bushing and spacing the body from the base andbushing, and punch means in said bores to penetrate the washer and upsetadjacent parts of the bushing and base.

7. In a tool to set an externally and internally threaded bushing in abase having a threaded hole to receive the external threads of thebushin, said tool having a body, an externally threaded stem on the bodyto enter the internal threads of the bushing, a stop surface on the bodyto engage the base, a shoulder on the body adjacent the stem extendingbelow the stop sur face, and punch means guided by the body to upsetadjacent portions of the base and bushing.

MAURICE J. FLYN'N.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 680,560 Barnes Aug. 13, 1901831,162 Hord Sept. 18, 1906 1,326,195 Hasty Dec. 30, 1919 1,724,312 PughAug. 13, 1929 1,797,390 Wood Mar. 24, 1931 1,952,395 'Iillyer et a1.Mar. 27, 1934 2,349,493 Enders May 23, 1944

